509816394140 has 48 divisors (see below), whose sum is σ = 1155685769280. Its totient is φ = 188333967360.

The previous prime is 509816394121. The next prime is 509816394167. The reversal of 509816394140 is 41493618905.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19095221 + ... + 19121900.

It is an arithmetic number, because the mean of its divisors is an integer number (24076786860).

Almost surely, 2^509816394140 is an apocalyptic number.

It is an amenable number.

509816394140 is an abundant number, since it is smaller than the sum of its proper divisors (645869375140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

509816394140 is a wasteful number, since it uses less digits than its factorization.

509816394140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38217182 (or 38217180 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 50.

The spelling of 509816394140 in words is "five hundred nine billion, eight hundred sixteen million, three hundred ninety-four thousand, one hundred forty".